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Later, during the Second World War they played a significant role in the Battle of Britain and continued to be used by the Royal Air Force and Royal Observer Corps (ROC) as simple clocks and keepsakes, until the end of the Cold War period.
Michael P Donaldson, Air Vice-Marshal RAF and Commandant Royal Observer Corps
TOCSIN, the codeword attached by the Royal Observer Corps to any reading on the Bomb Power Indicator after a nuclear strike on the United Kingdom during the Cold War